Given that we have collected pairs of observations on two variables X and Y , we would consider fitting a straight line with X as an explanatory variable if:

a. the change in Y is an additive constant.

b. the change in Y is a constant for each unit change in X

c. the change in Y is a fixed percent of Y

d. the change in Y is exponential

a. the change in Y is an additive constant.

b. the change in Y is a constant for each unit change in X

c. the change in Y is a fixed percent of Y

d. the change in Y is exponential

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